Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82b9cda156fbede…

MALICIOUS

PDF

62.0 KB Created: 2020-08-24 22:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01310843566bbd7583431cdf09268e40 SHA-1: 09a06bb3bfbdb9bc9161f1172fb07ffaab6dea47 SHA-256: a82b9cda156fbede204618b8e0885c0241e26355257e436ffed17cd465cfc83e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link that points to ttraff.cc, a known malicious domain. Additionally, it hosts a large number of external PDF links, many of which are generated with numeric slugs, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector is sufficient to classify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=cardiopat%25C3%25ADa+de+takotsubo+pdf
    • http://fazaxine.limousinesinaustin.com/uploads/1/3/2/3/132303035/74d7b5975f.pdf
    • http://files.cvhsmusicals.org/uploads/1/3/0/7/130739154/vuvumuk-luroseb-furagefur-megufulipaj.pdf
    • http://files.wealwayswander.com/uploads/1/3/2/6/132695601/d8d9a.pdf
    • http://files.computerclubrhcc.com/uploads/1/3/1/4/131437276/8058813.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/fundamental_attribution_error_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1670/files/zasad.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/mexomopabonololefufa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4313/3352/files/gtd_trello_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/53644599670.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/11339751633.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/agile_project_management_handbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8574/1724/files/advanced_diploma_in_information_technology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/subway_order_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a342.bin
0bd4af6c0152d5cf520d4475c05d4a17771d9729dbbfbe82ff988ab4cedb7f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA342 5168 bytes
font_01_sfnt_off0000b4e6.bin
4c8b85e7d9e33076e8c4efba94cb1e5c7e56574fe8e7a4bafc5acebc3a8e6914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 17468 bytes

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